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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: IdleTimeoutInputStream.html 926 2014-09-17 03:05:56Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.io;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.io.EOFException;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.io.IOException;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.io.InputStream;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.dellroad.stuff.java.Predicate;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.dellroad.stuff.java.TimedWait;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>/**<a name="line.18"></a>
<span class="sourceLineNo">019</span> * Wraps an {@link InputStream} and enforces a maximum time limit on how long any {@link InputStream#read read()}<a name="line.19"></a>
<span class="sourceLineNo">020</span> * operation may block. If the time limit is exceeded, an {@link IdleTimeoutException} is thrown.<a name="line.20"></a>
<span class="sourceLineNo">021</span> *<a name="line.21"></a>
<span class="sourceLineNo">022</span> * &lt;p&gt;<a name="line.22"></a>
<span class="sourceLineNo">023</span> * As a side effect of its design, this class may also be used to artificially inject data, EOF, or exceptions into the<a name="line.23"></a>
<span class="sourceLineNo">024</span> * {@code InputStream}, using the {@link AsyncInputStream.Listener} interface methods.<a name="line.24"></a>
<span class="sourceLineNo">025</span> * &lt;/p&gt;<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> * &lt;p&gt;<a name="line.27"></a>
<span class="sourceLineNo">028</span> * This class may also be used to allow testing the real-time state of an {@link InputStream} without actually reading<a name="line.28"></a>
<span class="sourceLineNo">029</span> * from it, via {@link #checkConnection}, which guarantees an immediate exception will be thrown if the underlying<a name="line.29"></a>
<span class="sourceLineNo">030</span> * {@link InputStream} has been closed, reached EOF, or itself thrown an exception.<a name="line.30"></a>
<span class="sourceLineNo">031</span> * &lt;/p&gt;<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> * &lt;p&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span> * All methods in this class are thread safe.<a name="line.34"></a>
<span class="sourceLineNo">035</span> * &lt;/p&gt;<a name="line.35"></a>
<span class="sourceLineNo">036</span> */<a name="line.36"></a>
<span class="sourceLineNo">037</span>public class IdleTimeoutInputStream extends InputStream implements AsyncInputStream.Listener {<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>    private static final AtomicInteger COUNTER = new AtomicInteger();<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>    private static final int OPEN = 0;<a name="line.41"></a>
<span class="sourceLineNo">042</span>    private static final int EOF = 1;<a name="line.42"></a>
<span class="sourceLineNo">043</span>    private static final int EXCEPTION = 2;<a name="line.43"></a>
<span class="sourceLineNo">044</span>    private static final int CLOSED = 3;<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>    private final AsyncInputStream asyncInputStream;<a name="line.46"></a>
<span class="sourceLineNo">047</span>    private final long timeout;<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>    private final byte[] xferBuf = new byte[500];<a name="line.49"></a>
<span class="sourceLineNo">050</span>    private Throwable exception;<a name="line.50"></a>
<span class="sourceLineNo">051</span>    private int xferLen;<a name="line.51"></a>
<span class="sourceLineNo">052</span>    private int state;<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>    /**<a name="line.54"></a>
<span class="sourceLineNo">055</span>     * Constructor.<a name="line.55"></a>
<span class="sourceLineNo">056</span>     *<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * @param in input source<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * @param threadName name for the reader thread, or null for default<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @param timeout maximum input idle time, or zero for infinity<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * @throws IllegalArgumentException if {@code timeout} is negative<a name="line.60"></a>
<span class="sourceLineNo">061</span>     */<a name="line.61"></a>
<span class="sourceLineNo">062</span>    public IdleTimeoutInputStream(InputStream in, String threadName, long timeout) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        if (timeout &lt; 0)<a name="line.63"></a>
<span class="sourceLineNo">064</span>            throw new IllegalArgumentException("timeout &lt; 0");<a name="line.64"></a>
<span class="sourceLineNo">065</span>        if (threadName == null)<a name="line.65"></a>
<span class="sourceLineNo">066</span>            threadName = this.getClass().getSimpleName() + "-" + IdleTimeoutInputStream.COUNTER.incrementAndGet();<a name="line.66"></a>
<span class="sourceLineNo">067</span>        this.asyncInputStream = new AsyncInputStream(in, threadName, this);<a name="line.67"></a>
<span class="sourceLineNo">068</span>        this.timeout = timeout;<a name="line.68"></a>
<span class="sourceLineNo">069</span>    }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>    /**<a name="line.71"></a>
<span class="sourceLineNo">072</span>     * Convenience constructor. Equivalent to:<a name="line.72"></a>
<span class="sourceLineNo">073</span>     *  &lt;blockquote&gt;&lt;code&gt;<a name="line.73"></a>
<span class="sourceLineNo">074</span>     *  IdleTimeoutInputStream(in, null, timeout);<a name="line.74"></a>
<span class="sourceLineNo">075</span>     *  &lt;/code&gt;&lt;/blockquote&gt;<a name="line.75"></a>
<span class="sourceLineNo">076</span>     *<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * @param in input source<a name="line.77"></a>
<span class="sourceLineNo">078</span>     * @param timeout maximum input idle time<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * @throws IllegalArgumentException if {@code timeout} is negative<a name="line.79"></a>
<span class="sourceLineNo">080</span>     */<a name="line.80"></a>
<span class="sourceLineNo">081</span>    public IdleTimeoutInputStream(InputStream in, long timeout) {<a name="line.81"></a>
<span class="sourceLineNo">082</span>        this(in, null, timeout);<a name="line.82"></a>
<span class="sourceLineNo">083</span>    }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>// InputStream<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span>    @Override<a name="line.87"></a>
<span class="sourceLineNo">088</span>    public synchronized int read() throws IOException {<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>        // Wait for some data<a name="line.90"></a>
<span class="sourceLineNo">091</span>        if (!this.waitForData(this.timeout, false))<a name="line.91"></a>
<span class="sourceLineNo">092</span>            return -1;<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>        // Wake up sleeping writer, if any<a name="line.94"></a>
<span class="sourceLineNo">095</span>        if (this.xferLen == this.xferBuf.length)<a name="line.95"></a>
<span class="sourceLineNo">096</span>            this.notifyAll();<a name="line.96"></a>
<span class="sourceLineNo">097</span><a name="line.97"></a>
<span class="sourceLineNo">098</span>        // Read off byte<a name="line.98"></a>
<span class="sourceLineNo">099</span>        final int r = this.xferBuf[0] &amp; 0xff;<a name="line.99"></a>
<span class="sourceLineNo">100</span>        System.arraycopy(this.xferBuf, 1, this.xferBuf, 0, --this.xferLen);<a name="line.100"></a>
<span class="sourceLineNo">101</span>        return r;<a name="line.101"></a>
<span class="sourceLineNo">102</span>    }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>    @Override<a name="line.104"></a>
<span class="sourceLineNo">105</span>    public synchronized int read(byte[] buf, int off, int len) throws IOException {<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span>        // Sanity check<a name="line.107"></a>
<span class="sourceLineNo">108</span>        if (off &lt; 0)<a name="line.108"></a>
<span class="sourceLineNo">109</span>            throw new IndexOutOfBoundsException("off &lt; 0");<a name="line.109"></a>
<span class="sourceLineNo">110</span>        if (len &lt; 0)<a name="line.110"></a>
<span class="sourceLineNo">111</span>            throw new IndexOutOfBoundsException("len &lt; 0");<a name="line.111"></a>
<span class="sourceLineNo">112</span>        if (off + len &gt; buf.length)<a name="line.112"></a>
<span class="sourceLineNo">113</span>            throw new IndexOutOfBoundsException("off + len &gt; buf.length");<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span>        // Wait for some data<a name="line.115"></a>
<span class="sourceLineNo">116</span>        if (!this.waitForData(this.timeout, false))<a name="line.116"></a>
<span class="sourceLineNo">117</span>            return -1;<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span>        // Wake up sleeping writer, if any<a name="line.119"></a>
<span class="sourceLineNo">120</span>        if (this.xferLen == this.xferBuf.length)<a name="line.120"></a>
<span class="sourceLineNo">121</span>            this.notifyAll();<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>        // Read off bytes<a name="line.123"></a>
<span class="sourceLineNo">124</span>        len = Math.min(len, this.xferLen);<a name="line.124"></a>
<span class="sourceLineNo">125</span>        System.arraycopy(this.xferBuf, 0, buf, 0, len);<a name="line.125"></a>
<span class="sourceLineNo">126</span>        System.arraycopy(this.xferBuf, len, this.xferBuf, 0, (this.xferLen -= len));<a name="line.126"></a>
<span class="sourceLineNo">127</span>        return len;<a name="line.127"></a>
<span class="sourceLineNo">128</span>    }<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span>    // Wait up to 'duration' milliseconds for something to happen; or if negative, just check status<a name="line.130"></a>
<span class="sourceLineNo">131</span>    private synchronized boolean waitForData(final long duration, boolean exceptionOnEOF) throws IOException {<a name="line.131"></a>
<span class="sourceLineNo">132</span><a name="line.132"></a>
<span class="sourceLineNo">133</span>        // Wait for data or exception<a name="line.133"></a>
<span class="sourceLineNo">134</span>        for (boolean timedOut = false; !timedOut; ) {<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>            // Check state<a name="line.136"></a>
<span class="sourceLineNo">137</span>            switch (this.state) {<a name="line.137"></a>
<span class="sourceLineNo">138</span>            case OPEN:<a name="line.138"></a>
<span class="sourceLineNo">139</span>                if (this.xferLen &gt; 0)<a name="line.139"></a>
<span class="sourceLineNo">140</span>                    return true;<a name="line.140"></a>
<span class="sourceLineNo">141</span>                break;<a name="line.141"></a>
<span class="sourceLineNo">142</span>            case EOF:<a name="line.142"></a>
<span class="sourceLineNo">143</span>                if (exceptionOnEOF)<a name="line.143"></a>
<span class="sourceLineNo">144</span>                    throw new EOFException();<a name="line.144"></a>
<span class="sourceLineNo">145</span>                return false;<a name="line.145"></a>
<span class="sourceLineNo">146</span>            case EXCEPTION:<a name="line.146"></a>
<span class="sourceLineNo">147</span>                if (this.exception instanceof IOException)<a name="line.147"></a>
<span class="sourceLineNo">148</span>                    throw (IOException)this.exception;<a name="line.148"></a>
<span class="sourceLineNo">149</span>                if (this.exception instanceof RuntimeException)<a name="line.149"></a>
<span class="sourceLineNo">150</span>                    throw (RuntimeException)this.exception;<a name="line.150"></a>
<span class="sourceLineNo">151</span>                throw new RuntimeException(this.exception);                 // should never happen<a name="line.151"></a>
<span class="sourceLineNo">152</span>            case CLOSED:<a name="line.152"></a>
<span class="sourceLineNo">153</span>                throw new IOException("stream is closed");<a name="line.153"></a>
<span class="sourceLineNo">154</span>            default:<a name="line.154"></a>
<span class="sourceLineNo">155</span>                throw new RuntimeException("internal error");<a name="line.155"></a>
<span class="sourceLineNo">156</span>            }<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span>            // Not waiting, just checking status?<a name="line.158"></a>
<span class="sourceLineNo">159</span>            if (duration &lt; 0)<a name="line.159"></a>
<span class="sourceLineNo">160</span>                return false;<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>            // Wait for some data to appear, timeout, EOF, exception, or closure<a name="line.162"></a>
<span class="sourceLineNo">163</span>            try {<a name="line.163"></a>
<span class="sourceLineNo">164</span>                timedOut = !TimedWait.wait(this, duration, new Predicate() {<a name="line.164"></a>
<span class="sourceLineNo">165</span>                    @Override<a name="line.165"></a>
<span class="sourceLineNo">166</span>                    public boolean test() {<a name="line.166"></a>
<span class="sourceLineNo">167</span>                        return IdleTimeoutInputStream.this.state != OPEN || IdleTimeoutInputStream.this.xferLen &gt; 0;<a name="line.167"></a>
<span class="sourceLineNo">168</span>                    }<a name="line.168"></a>
<span class="sourceLineNo">169</span>                });<a name="line.169"></a>
<span class="sourceLineNo">170</span>            } catch (InterruptedException e) {<a name="line.170"></a>
<span class="sourceLineNo">171</span>                Thread.currentThread().interrupt();                         // start over waiting!<a name="line.171"></a>
<span class="sourceLineNo">172</span>            }<a name="line.172"></a>
<span class="sourceLineNo">173</span>        }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span>        // We timed out; throw IdleTimeoutException<a name="line.175"></a>
<span class="sourceLineNo">176</span>        this.asyncInputStream.close();<a name="line.176"></a>
<span class="sourceLineNo">177</span>        this.exception = new IdleTimeoutException(duration);<a name="line.177"></a>
<span class="sourceLineNo">178</span>        this.state = EXCEPTION;<a name="line.178"></a>
<span class="sourceLineNo">179</span>        throw (IOException)this.exception;<a name="line.179"></a>
<span class="sourceLineNo">180</span>    }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span>    @Override<a name="line.182"></a>
<span class="sourceLineNo">183</span>    public synchronized void close() {<a name="line.183"></a>
<span class="sourceLineNo">184</span>        switch (this.state) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>        case OPEN:<a name="line.185"></a>
<span class="sourceLineNo">186</span>        case EOF:<a name="line.186"></a>
<span class="sourceLineNo">187</span>        case EXCEPTION:<a name="line.187"></a>
<span class="sourceLineNo">188</span>            this.asyncInputStream.close();<a name="line.188"></a>
<span class="sourceLineNo">189</span>            this.state = CLOSED;<a name="line.189"></a>
<span class="sourceLineNo">190</span>            this.notifyAll();                   // read() and close() could be called by two different threads<a name="line.190"></a>
<span class="sourceLineNo">191</span>            break;<a name="line.191"></a>
<span class="sourceLineNo">192</span>        case CLOSED:<a name="line.192"></a>
<span class="sourceLineNo">193</span>            break;<a name="line.193"></a>
<span class="sourceLineNo">194</span>        default:<a name="line.194"></a>
<span class="sourceLineNo">195</span>            throw new RuntimeException("internal error");<a name="line.195"></a>
<span class="sourceLineNo">196</span>        }<a name="line.196"></a>
<span class="sourceLineNo">197</span>    }<a name="line.197"></a>
<span class="sourceLineNo">198</span><a name="line.198"></a>
<span class="sourceLineNo">199</span>    @Override<a name="line.199"></a>
<span class="sourceLineNo">200</span>    public synchronized int available() throws IOException {<a name="line.200"></a>
<span class="sourceLineNo">201</span>        return this.waitForData(-1, false) ? this.xferLen : 0;<a name="line.201"></a>
<span class="sourceLineNo">202</span>    }<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>    /**<a name="line.204"></a>
<span class="sourceLineNo">205</span>     * Check the status of the underlying {@link InputStream}.<a name="line.205"></a>
<span class="sourceLineNo">206</span>     *<a name="line.206"></a>
<span class="sourceLineNo">207</span>     * &lt;p&gt;<a name="line.207"></a>
<span class="sourceLineNo">208</span>     * This method guarantees that if the underlying {@link InputStream} has been closed,<a name="line.208"></a>
<span class="sourceLineNo">209</span>     * reached EOF, or thrown an exception, then this method will throw an immediate exception.<a name="line.209"></a>
<span class="sourceLineNo">210</span>     * &lt;/p&gt;<a name="line.210"></a>
<span class="sourceLineNo">211</span>     *<a name="line.211"></a>
<span class="sourceLineNo">212</span>     * @throws EOFException if the underlying {@link InputStream} has reached EOF<a name="line.212"></a>
<span class="sourceLineNo">213</span>     * @throws IOException if the underlying {@link InputStream} threw an {@link IOException}<a name="line.213"></a>
<span class="sourceLineNo">214</span>     * @throws IOException if the underlying {@link InputStream} has been closed<a name="line.214"></a>
<span class="sourceLineNo">215</span>     */<a name="line.215"></a>
<span class="sourceLineNo">216</span>    public synchronized void checkConnection() throws IOException {<a name="line.216"></a>
<span class="sourceLineNo">217</span>        this.waitForData(-1, true);<a name="line.217"></a>
<span class="sourceLineNo">218</span>    }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span>// AsyncInputStream.Listener<a name="line.220"></a>
<span class="sourceLineNo">221</span><a name="line.221"></a>
<span class="sourceLineNo">222</span>    @Override<a name="line.222"></a>
<span class="sourceLineNo">223</span>    public synchronized void handleInput(byte[] buf, int off, int len) {<a name="line.223"></a>
<span class="sourceLineNo">224</span>        while (len &gt; 0) {<a name="line.224"></a>
<span class="sourceLineNo">225</span><a name="line.225"></a>
<span class="sourceLineNo">226</span>            // Check state<a name="line.226"></a>
<span class="sourceLineNo">227</span>            switch (this.state) {<a name="line.227"></a>
<span class="sourceLineNo">228</span>            case OPEN:<a name="line.228"></a>
<span class="sourceLineNo">229</span>                break;<a name="line.229"></a>
<span class="sourceLineNo">230</span>            case EOF:<a name="line.230"></a>
<span class="sourceLineNo">231</span>            case EXCEPTION:<a name="line.231"></a>
<span class="sourceLineNo">232</span>            case CLOSED:<a name="line.232"></a>
<span class="sourceLineNo">233</span>                return;<a name="line.233"></a>
<span class="sourceLineNo">234</span>            default:<a name="line.234"></a>
<span class="sourceLineNo">235</span>                throw new RuntimeException("internal error");<a name="line.235"></a>
<span class="sourceLineNo">236</span>            }<a name="line.236"></a>
<span class="sourceLineNo">237</span><a name="line.237"></a>
<span class="sourceLineNo">238</span>            // Copy what we can, if anything<a name="line.238"></a>
<span class="sourceLineNo">239</span>            final int copy = Math.min(len, this.xferBuf.length - this.xferLen);<a name="line.239"></a>
<span class="sourceLineNo">240</span>            if (copy &gt; 0) {<a name="line.240"></a>
<span class="sourceLineNo">241</span><a name="line.241"></a>
<span class="sourceLineNo">242</span>                // Copy data<a name="line.242"></a>
<span class="sourceLineNo">243</span>                System.arraycopy(buf, off, this.xferBuf, this.xferLen, copy);<a name="line.243"></a>
<span class="sourceLineNo">244</span>                this.xferLen += copy;<a name="line.244"></a>
<span class="sourceLineNo">245</span>                off += copy;<a name="line.245"></a>
<span class="sourceLineNo">246</span>                len -= copy;<a name="line.246"></a>
<span class="sourceLineNo">247</span><a name="line.247"></a>
<span class="sourceLineNo">248</span>                // Notify sleeping readers, if any<a name="line.248"></a>
<span class="sourceLineNo">249</span>                if (this.xferLen == copy)<a name="line.249"></a>
<span class="sourceLineNo">250</span>                    this.notifyAll();<a name="line.250"></a>
<span class="sourceLineNo">251</span>                continue;<a name="line.251"></a>
<span class="sourceLineNo">252</span>            }<a name="line.252"></a>
<span class="sourceLineNo">253</span><a name="line.253"></a>
<span class="sourceLineNo">254</span>            // Wait until there's more room in the transfer buffer<a name="line.254"></a>
<span class="sourceLineNo">255</span>            try {<a name="line.255"></a>
<span class="sourceLineNo">256</span>                TimedWait.wait(this, 0, new Predicate() {<a name="line.256"></a>
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<span class="sourceLineNo">258</span>                    public boolean test() {<a name="line.258"></a>
<span class="sourceLineNo">259</span>                        return IdleTimeoutInputStream.this.state != OPEN<a name="line.259"></a>
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<span class="sourceLineNo">263</span>            } catch (InterruptedException e) {<a name="line.263"></a>
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<span class="sourceLineNo">285</span>    @Override<a name="line.285"></a>
<span class="sourceLineNo">286</span>    public synchronized void handleException(Throwable e) {<a name="line.286"></a>
<span class="sourceLineNo">287</span>        switch (this.state) {<a name="line.287"></a>
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<span class="sourceLineNo">297</span>        default:<a name="line.297"></a>
<span class="sourceLineNo">298</span>            throw new RuntimeException("internal error");<a name="line.298"></a>
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<span class="sourceLineNo">302</span><a name="line.302"></a>




























































</pre>
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